Briqueting-machine.



2 SHEETS-SHEET l.

Patented May 29, 1917.

G. W. RIGBY.

BRIQUETING MACHNE.

APPucATmN man 11116.11. 1913.

INVENTOR WITNESSES m( ,wsms pneus co.. PwowMmo wAsmNu mn. n

' G. W. RlGBY.

BRIQUETING MACHINE.

APPLICATION FILED Aulas.

Patented May 29,

2 SHEET$-SHEET 2 Qu. 5S

I :ili-

INVENTOR WITNESSES ITE@ STATE@ "PATENT @FFICEO GRANT W. RIGBY, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0 ISAAC WEIL, O1?

PITTSBURGH, PENNSYLVANIA.

BRIQUETING-MACHINE.

Specicaton of Letters Patent.

Patented May 29, 1917.

Application led August 8, 1913. Serial No. 783,752.

To all 107mm t may concern:

Be it known that 1, GRANT W. RIGBY, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Briqueting- Machines, (Case Bg) and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to molding machines, and has special reference to what are known as briqueting machines for makn ing briquets from granular or pulverulent fuel preparatory to burning the same or from finely divided or pulverized ores or minerals preparatory to smelting the same or from other semi-plastic materials and for similar uses.

The object of my invention is to provide a cheap, simple and efficient molding ma# chine for these purposes which will contain few parts, will be positive in its action, will not be liable to get out of order easily and one in whichthe parts can be easily taken out for repairing, change or renewal, as well as one providing for the proper adjustment of the parts, great strength, and one with all the working parts contained within the frame of the machine.

To enable others skilled in the art to which my invention appertains, to construct and use my improved molding machine, I will describe the same more fully, referring to the accompanying drawings in which- Figure 1 is a plan view of my improved molding machine.

Fig. 2 is a longitudinal sectional section of the same.

Fig. 3 is a detail sectional view showing another form of the invention.

Fig. 3a is an enlarged detail section taken through one of the retaining plungers shown in Fig` 3.

Like letters of reference herein indicate like parts in each of the igures of the drawing.

The machine A is of the same general type as that shown in my United States Letters-Patent, No. 792,729, granted June 20, 1905, and No. 795,007, granted July 18, 1905, and consists generally of the main frame 1 having side portions 2, front and rear portions 3 and 3 and bottom plates 4, while cover plates 5 extend from the rear portion 3 along and over a portion of the machine A and are bolted to said rear portion and side portions in theusual manner. rlhe rear end of the bottom 4 is connected to the rear end portion 3 by a depressed portion 4, and the machine A is supported upon a bed or foundation B by the side portions 2 and end portions l3. Extending through the side frames 2 and at the rear of the machine A is the crank-shaft 6, which has its bearings 7 in such frames and has a gear wheel S mounted thereon exteriorly of one of the frames 2 for meshing with a pinion S on a counter-shaft S at the front end of the machine and through which power applied to such machine. A crank 9 is formed on the shaft 6 and is connected with the pitman 10, which is connected to the cross-head 11 by means of the pivot pin 12 journaled in said cross-head. The cross head 11 is adapted to slide in suitable guides 12 in the frame 1, and removably fitting in said cross-head and extending out from the front end of the same are the reciprocating plungers 13, each of which is held in its seat 13 in said head by a set screw 13.

rlhe front end 8 of the frame 1 is provided withthe cylinder portion 14 which is connected to the rear of said end and is provided with chambers 14 therein, each of which contains a resisting plunger 15 and these resisting plungers are set in line with the plungers 13 and are in the form of pistons by having an enlargement 15 at their front ends, so that each of said enlargements will form piston heads on said plungers for working in said chambers. A port 16 leads from the ordinary hydraulic accumulator (not shown) or other means for giving constant and varying pressure, through the cylinder portion 14 into a passage-way 16 in the front end of said cylinder, which passageway connects with each of the chambers 14 in said cylinder' and at the front end thereof. A threaded stuffing box or bushing 15 lits around each of the plungers 15 at their rear ends to limit the movement of' said plungers by their piston heads 15 engaging the front end of the same, and such bushings also act as an adjustment for the proper location of the rear or working ends of said plungers.

Mounted within the frame 1 is the feed box 17, which is reciprocated at the proper time from the shaft by means of a cam 17 on each side of said shaft engaging with yoke pieces 17 around the same and suitably connected to said box by an extension 17 a. The feed box 17 has openings 18 formed in the rear wall of the same through which the plungers 13 are adapted to travel, and openings 19 are formed in the front wall of said box for the reception of the plungers 15.

The use and operation of my improved briqueting machine is as follows-The material to be made into the form of blocks or briquets is fed into the feed box in any suitable manner and power being applied to the shaft 8 will act to revolve the shaft 6 through the ypinion 8 and `gear wheel 8.'

Then it is desired to form the briquets the feed box 17 is at the position shown in Fig. 2 and the plungers 13 are at the rear end of their stroke by their working or front end faces at the rear wall of the feed box 17, the forward revolving of the shaft 6 will move said plungers forward by the crank 9, pitman 10 and crosshead 11, and through said feed box into said box which will press the material in such box and between the working concave ends 151 of the plungers 13 and 15 and thereby form the globular briquet A, by and between such ends. Upon the further revolving of the shaft 6 the cams 17 will engage their yoke pieces 17 to rapidly move the feed box 17 connected to said pieces toward the rear end of the machine A, which will allow the briquets a to remain between the plungers 13 and 15, and as the plungers 13 are also moved rearward at the same time by the crank 9 on the crank shaft 6, through pitman 10 and cross head 11, but at a slower rate of speed than said feed box, the pressure on said briquets will be released. As soon as the feed box 17 in such movement reaches a position that adjustable set screws 20 on the rear wall of said box come in contact with one of spring controlled and pivoted dogs 21 on said cro'ss head, ejector bars 22 in said plungers 13 are engaged by the other ends and moved forward to allow the headed front ends 22 on said bars to free the rear portions of the briquets a from the concave ends 152L on said plungers, while at the same time the front portions of such briquets are also freed from the concave ends 15a on the plungers 15 by means of the headed rearv ends 23 on the movable ejector bars 23. These bars 23 are within each of the plungers 15 and are controlled by springs 24 at their Vfront ends, so that such bars are moved outward or rearward by said springs when the pressure on the briquets is released by the withdrawing of the plungers 13 therefrom to thereby permit such briquets to drop down to the conveyer belt b. When the feed box 17 returns to its forward position the ejector bars 23 are held in their forward positions by adjustable set screws l25 on the front wall of said box engaging with arms 25I on the cylinder 14, which are spring controlled by the springs 26 in the said 'cylinder back of said bars, and the ends of such arms press through slots 25 in the plungers 15 and engage with the bars 23, as shown in Fig. 2.

After the briquets a are thus dropped down onto the conveyer Z9, the cams 17 will quickly return the feed box 17 to the forward position, as shown in Fig. 2, by the continued forward movement of the shaft 6, while such further movement of the shaft 6 will return the plungers 13 to their front or forward positions at a slower rate of speed than such box, so that such plungers and such box will then be ready for another operation of forming the briquets, and during the formation of the briquets, as above described, the water pressure on the plungers 15 is regulated by the cylinder 14 through means of the accumulator, so that the briquets will not receive a greater pressure than that due to the pressure in the resisting chambers 111 communicating with said accunnilator, which will thereby prevent any overcharging of the material in forming the briquets and any danger in breakage to the parts of the machine.

As shown in Fig. 3 the briquets a may be expelled from the plungers 15 by means of the ejectors 27 within the same, which are operated by means of water pressure from the accumulator, and in this case the air will pass from the passageway 16 into the cylinder chamber 14e thence through a passageway 27 in a small cylinder 23 in said plungers and against the rear of a piston head 29 on the ejectors 27 to move said ejectors outward or rearward to expel the briquets from said plungers, but in most cases, however, the accumula-tor pressure would be so great that the said piston heads in order to give the required pressure would necessarily be so small as to make its use impracticable. In order to overcome this objection another piston head 29 is placed on the ejector bars 27 and on the other side from where the passageway 27 enters the small cylinder 28, which head 29 will be of smaller area than the head 29, and thus said head 29 will tend to equalize the pressure exerted against the head 29 to thereby form a differential piston ejector. In this manner such piston heads for operating these ejectors may be made of any desired size as found most practicable for the purpose. In said Fig. 3 another manner of operating the ejector bars 20A in the plungers 13 is shown, in which the dogs 22 for operating such plungers are pivoted on said plungers and extend below the same, so that the adjusting screws 22 on the rear wall of the feed box 17 can engage with the same to throw the said bars forward and thus expel the briquets a from the concave end' on the said plungers.

Various other modifications and changes in the design, construction and operation of my improved molding machine may be resorted to Without departing from the spirit of the invention or sacriiicing any of its advantages.

That l claim as my invention and desire to secure by Letters-Patent is l. A plunger mechanism for a molding machine having a reciprocating feed box for the material, comprising reciprocating plungers cooperating With said feed box and having material-receiving cavities in the ends thereof, movable resisting plungers in line With said first-named plungers and having material-receiving cavities in the ends thereof, said resisting plungers being held normally stationary against pressure and having iuid cylinders therein, ejector bars Within said resisting plungers for expelling the molded material from the cavities thereof, and diiierential piston heads connected with said bars and contained in said cylinder.

2. In a plunger mechanism for a molding machine, reciprocating plungers having material-receiving cavities in the ends thereof, movable resisting plungers in line With said reciprocating plungers and having material-receiving cavities in the ends thereof, said resisting plungers being held normally stationary against pressure, and having fluid cylinders therein, pressure-iiuid-receiving cylinders for receiving the other ends of said resisting plungers to hold the same normally stationary against pressure, ejector bars Within said resisting plungers for eX- polling the molded material from the cavities thereof, and differential piston heads connected With said ejector bars and contained in said vlirst-named cylinders, for the purposes set forth.

3. In a plunger mechanism for a molding machine, reciprocating compressing plungers, movable resisting plungers alined With said compressing plungers and having fluid cylinders therein, said first and second mentioned plungers having material receiving cavities in their adjacent terminals, slidable ejector bars carried by the lresisting plungers, and differential pistons carried by the bars and contained in said cylinders.

4. In a molding machine, a receptacle for containing a quantity of material considerably greater than the quantity molded at each operation, a pair of opposed molding plungers having mold-cavities at their opposing ends and arranged, When brought together, to form a mold complete in itself, means for effecting a relative movement between said plungers to effect the molding operation and the discharging operation, and means for effecting a relative movement between said receptacle and said plungers such that the molding operation takes place Within said receptacle and the discharging operation takes place outside said receptacle.

In testimony whereof, I the said GRANT W. RIGBY, have hereunto set my hand.

GRANT W. RIGBY.

Witnesses:

J. N. COOKE, T. B. HUMPHRms.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

